diff options
| author | Mark Brown <broonie@linaro.org> | 2013-11-24 14:35:18 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2013-11-24 14:35:18 +0000 |
| commit | 30c27abd28fa168d7ebd2e5286f1fe473c74bfa9 (patch) | |
| tree | 9936b38c0c81cd430d5e75906c1207d127fe588c /include/linux/lockref.h | |
| parent | 16ec790938d4f356c82fab27b9a9adf4d6fe19a6 (diff) | |
| parent | 6ce4eac1f600b34f2f7f58f9cd8f0503d79e42ae (diff) | |
Merge tag 'v3.13-rc1' into asoc-arizona
Linux 3.13-rc1
Diffstat (limited to 'include/linux/lockref.h')
| -rw-r--r-- | include/linux/lockref.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/lockref.h b/include/linux/lockref.h index f279ed9a9163..c8929c3832db 100644 --- a/include/linux/lockref.h +++ b/include/linux/lockref.h @@ -15,10 +15,15 @@ */ #include <linux/spinlock.h> +#include <generated/bounds.h> + +#define USE_CMPXCHG_LOCKREF \ + (IS_ENABLED(CONFIG_ARCH_USE_CMPXCHG_LOCKREF) && \ + IS_ENABLED(CONFIG_SMP) && !BLOATED_SPINLOCKS) struct lockref { union { -#ifdef CONFIG_CMPXCHG_LOCKREF +#if USE_CMPXCHG_LOCKREF aligned_u64 lock_count; #endif struct { @@ -36,4 +41,10 @@ extern int lockref_put_or_lock(struct lockref *); extern void lockref_mark_dead(struct lockref *); extern int lockref_get_not_dead(struct lockref *); +/* Must be called under spinlock for reliable results */ +static inline int __lockref_is_dead(const struct lockref *l) +{ + return ((int)l->count < 0); +} + #endif /* __LINUX_LOCKREF_H */ |